Gun sight



s. e. GREEN.

GUN SIGHT.

APPLICATION FILED DEC.,27,-1920. 1,405,580. Patented Feb. 7, 1922.

as. GEUMETRlGAl. lNsTRul diis'iafa,

UNITED STATES PATENT OFFICE.

SAMUEL G. GREEN, OF THE UNITED STATES ARMY,

GUN SIGHT.

Specification of Letters Patent.

Patented Feb. 7, 1922.

Application filed December 27, 1920. Serial No. 433,168.

useful Improvements in Gun Sights, of"

which the following is a specification.

The subject of my invention is a gun sight intended for use on machine guns and other forms of firearms.

An eflicient sight should have the sight blade protected from injury or distortion through accidental knocks or blows; should have the sight blade capable of adjustment; should have an aperture in which the sight blade is situated and in which the blade is always centered; and should permit the sight blade to be lighted in such a manner that the sighting edge or point is most prominent. M

To gain the above cited objects my present invention consists, broadly, of a sight housing having a block adjustably mounted therein and carrying the sight blade.

More specifically, my invention consists in a housing having longitudinal and transverse communicating apertures, an apertured block mounted for adjustment in the transverse aperture and extending across the longitudinal aperture, means for effecting and maintaining any desired adjustment of the block, and a sight blade detachably mounted in the block and located centrally of the aperture, the blade so formedas to present shadows or dark surfaces ad acent the sighting edge to assure rapid and easy pick-up of the edge.

Vith these and other objects in view which will hereinafter more fully appear my invention consists in the novel arrangement and combination of parts and in the details of construction hereinafter described and claimed, it being understood that the changes in the precise embodiment of my invention herein disclosed may be made within the scope of the claims.

A practical embodiment of my invent on is shown in the accompanying drawing wherein Fig. 1 is a rear elevation of my improved si ht- Fig. 2, a side elevation of the same;

Fig. 3, a section on the line 33 of 2;

Fig. 4:, a section on the line H of Fig. 1;

Fig. 5, a perspective view of the block;

Fig. 6, a perspective of the sight housing;

Fig. 7, a perspective view of a preferred form of sight blade; and

Fig. 8, a perspective view of a modified form of sight blade.

In the drawing, where like characters of reference denote corresponding parts in the several views, my invention is shown as comprlslng a housing 1 adapted for attachment to a gun and, in this instance, formed with a curved face 9 adapted to seat on the water jacket or casing of machine guns and with apertures 10 for the reception of machine screws or like fastening means by which the housing may be secured to the water jacket or casing. The housing is formed with a longitudinal aperture providing the windows 5 and 6 and with a transverse aperture 7 communicating with and formed at right angles to the longitudinal aperture. In the transverse aperture I provide means for adjustably securing the sight block in place such means, as herein shown, consisting of a dove tail groove 8 formed in the floor of the aperture 7.

My invention further comprises a sight block 2 which is formed with a dove tail rib 13 adapted to engage with a close sliding fit in the groove 8. The block 2 is formed with a longitudinal sighting aperture 14, in the floor of which is provided a centrally located groove 15 for the reception of the sight blade. Bore s 11 may be provided in the block, and communicated with the roove 15 for the reception of pins 4 by which the sight blade is detachably secured in place in. the groove. To permit considerable adjustment of the block and at the same time prevent the admission of light through the openings to the aperture 7 wings or flanges 12 are provided at each side of the block.

A sight blade 3 fits in the groove 15 and is provided with apertures 16 for the reception of the pins 4 and is further formed with an under cut and serrated portion 17 below the sighting edge 19 which, as will be readily understood, provides a shadowed or darkened portion immediately adjacent the edge and causes the edge to stand out prominently. The rear face 18 of the blade is preferably adapted to lie flush with the rear face of the block 2.

In order to provide for delicate and accurate adjustment of the block 2 and sight 3 an adjusting screw 24 is threaded in the block. This screw includes an enlarged head 25 engaged in recesses 26 formed in the walls of the groove 8 and whereby the screw is held during rotation against longitudinal movement with respect to the housing 1 to thereby effect lateral adjustment of the block. In practice the head 25 may be graduated to indicate when the ro tation of the screw has effected the desired adjustment of the block. To maintain the block 2 in a desired adjustment against the possibility of displacement due to accidental rotation of the screw 24, I thread in the block a binding screw 26' so positioned that it may be operated to impinge against the rib 13 and thereby positively lock the latter against rotation.

In the alternative form of blade shown in Fig. 5 I provide a somewhat similar form of blade 3 having apertures 16' for the reception of the pins 4 by which the blade is locked in place in the groove 15 and having a plane substantially vertical face 18 which is flush with the rear face of the block 2 and at the upper end of which is the sighting edge 19.

From the foregoing it will be evident that the housing 1 amply protects the sight from displacement or accidental blows and that the sight may be adjusted through adjustment of the block 2 within the housing 1, the block 2 being protected from accidental displacement by reason of the fact that the side faces of the block lie within the aperture 7 and that the sight blade is never moved with respect to the block 2 and is, consequently, always maintained in a central position in the aperture. In addition my invention provides a more efiicient sight for various atmospheric and light conditions and gives the gunner a clear distinct sight always efficiently hooded and yet perfectly centered both lateral and vertical. The housing especially protects the sight block from accidental dislocation. A perfect adjustment of sight to get the sight blade centered over the axis of the bore of the gun is gained with no sacrifice of losing the center of the hood as with the ordinary hooded sight or loss of protection to the sight. The rectangular shape of the sight hood serves to cover the target and can be used to estimate ranges very accurately.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A gun sight, including a housing adapted for connection to a gun and provided with longitudinal and transverse communicating apertures, the floor of the transverse aperture having a dove tailed groove formed therein, an apertured block formed with a dove tailed rib to engage in the groove and adjustably secure the block in the housing, flanges extending from the side faces of the block, said block provided with a groove formed centrally of the aperture and situated in the floor thereof, a sight blade positioned in the groove and having an under cut serrated rear face to form a sighting edge, and means for detachably securin the sight blade in place.

2. r gun sight, including a housing adapted for connection to a gun and provided with longitudinal and transverse communicating apertures, the floor of the transverse aperture having a dove tailed groove formed therein, an aipertured block formed with a dove tailed rib to engage in the groove and adjustably secure the block in the housing, flanges extending from the side faces of the block, said block provided with a groove formed centrally of the aperture and situated in the floor thereof, and a sight blade positioned in the groove.

3. A un sight including a housing having a sight opening therethrough and an opening extending transversely of the housing and communicating with the sight opening, a block mounted in the housing and adjustable transversely of the sight opening, the sides of the block closing the openings to the transverse aperture, said block provided with a sight opening, and a sight blade mounted in the block and positioned centrally of the sight opening therein.

4. A gun sight including a housing having a sight opening therethrough, a block mounted in the housing and adjustable transversely of the sight opening, said block provided with a sight opening and a sight blade mounted in the block and positioned centrally of the sight opening thereof.

5. A gun sight, including a housing having a sight opening and a transverse aperture communicating with the said opening, and means adjustable transversely of the sight opening for closing the openings to the transverse aperture, and a sight blade carried by said adjustable means.

6. A gun sight including a housing having a sight opening, means provided with a sight opening and adjustable transversely of the housing, and a sight blade carried by said means and disposed centrally of the sight opening thereof.

7. A gun sight including a housing having a sight opening therethrough, a block mounted in the housing for adjustment transversely of the sight opening, said block provided with a sight opening, a sight blade mounted in the block and positioned centrally of the sight opening thereof, and means for adjusting the block.

8. A gun sight including a housing having a sight opening therethrough, a block mounted in the housing for adjustment transversely of the sight opening, said block provided with a sight opening, a sight blade mounted in the block, and positioned centrally of the sight opening thereof, means Ill was, lNSTRUFd'ELEiE-J 2:51,

mounted in the housing for adjustment transversely of the sight opening, said block provided with a sight opening, a sight blade mounted in the block and positioned centrally of the sight opening thereof, screw means for adjusting said block, and means for locking said screw means against operation to secure the block in a desired adjustment.

In testimony whereof I hereunto aflix my signature.

SAMUEL G. GREEN. 

